Sigh

How do you explain to a four-year-old that your dear kitty of 15-years is going to pass away soon? Tino's cancer is obviously advancing and it's tearing us up. I've ordered "Cat Heaven" and "For Every Cat an Angel" for him. We'll see if I can get through them without blubbering and freaking him out even more. Sigh. Why can't pets live as long as we do?